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Table 4 Effect of maternal anxiety on gestational age

From: Maternal Anxiety and Infants Birthweight and Length of Gestation. A sibling design

  Crude Step1* Step2** Step3***
Beta [95% CI] Beta [95% CI] Beta [95% CI] Beta [95% CI]
Full cohort
 No Anxiety 0 [Reference] 0 [Reference] 0 [Reference] 0 [Reference]
 Week 17 -0.64 [-1.12, -0.16] -0.61 [-1.09, -0.13] -0.54 [-1.01, -0.07] -0.44 [-0.91, 0.04]
 Week 30 -1.4 [-1.9, -0.89] -1.35 [-1.86, -0.84] -1.23 [-1.73, -0.74] -1.14 [-1.64, -0.64]
 Both -1.89 [-2.53, -1.25] -1.82 [-2.46, -1.18] -1.69 [-2.32, -1.06] -1.52 [-2.15, -0.89]
 Sample size 91,165 91,165 91,165 91,165
Sibling cohort
 No Anxiety 0 [Reference] 0 [Reference] 0 [Reference] 0 [Reference]
 Week 17 0.35 [-0.21, 0.92] 0.35 [-0.21, 0.92] 0.37 [-0.19, 0.94] 0.36 [-0.2, 0.93]
 Week 30 -1.08 [-1.79, -0.37] -1.08 [-1.8, -0.37] -1.13 [-1.84, -0.42] -1.11 [-1.82, -0.4]
 Both -0.54 [-1.61, 0.52] -0.54 [-1.61, 0.53] -0.6 [-1.68, 0.47] -0.54 [-1.62, 0.53]
 Sample size1 12,480 12,480 12,480 12,480
  1. *Adjusted for smoking and alcohol intake.
  2. **Adjusted for smoking, alcohol intake, parity, birth complication, child’s sex and preeclampsia.
  3. ***Adjusted for smoking, alcohol intake, parity, birth complication, child’s sex, preeclampsia, maternal age, education and marital status.
  4. 1Number of sibling “pairs”.